in reply to
Re^2: Subtracting Stringified Negative Numbers (carrots)
in thread Subtracting Stringified Negative Numbers
Posts on this site occur in chronological order. The OP reveals that the error message blames '^\'. My mistake was simply that I didn't realise the parser intended this as a representation of ctrl-\ - a finding published later than my post. But obviously from your comment, you didn't know that either or didn't draw the correct inference.
^M Free your mind!